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如图是从一幅扑克牌中取出的两组牌,分别是黑桃1,2,3,4红桃1,2,3,4,将...
如图是从一幅扑克牌中取出的两组牌,分别是黑桃1,2,3,4红桃1,2,3,4,将它们背面朝上分别重新洗牌后,从两组牌中各摸出一张,那么摸出的两张牌面数字之和等于7的概率是( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163850605240590/SYS201310221638506052405008_ST/images0.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163850605240590/SYS201310221638506052405008_ST/0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163850605240590/SYS201310221638506052405008_ST/1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163850605240590/SYS201310221638506052405008_ST/2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163850605240590/SYS201310221638506052405008_ST/3.png)
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如图,等腰梯形ABCD中,AD∥BC,AB=DC=1,BD平分∠ABC,BD⊥CD,则AD+BC等于( )
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163850605240590/SYS201310221638506052405006_ST/images0.png)
A.2
B.3
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如图,在方格纸中的△ABC经过变换得到△DEF,正确的变换是( )
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C.把△ABC绕着点A顺时针方向90°旋转,再右平移7格
D.把△ABC绕着点A逆时针方向90°旋转,再右平移7格
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已知⊙O
1和⊙O
2的半径分别为2和5,如果两圆的位置关系为外离,那么圆心距O
1O
2的取值范围在数轴上表示正确的是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163850605240590/SYS201310221638506052405004_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163850605240590/SYS201310221638506052405004_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163850605240590/SYS201310221638506052405004_ST/images2.png)
D.
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由方程组
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131022163850605240590/SYS201310221638506052405003_ST/0.png)
可得出x与y的关系式是( )
A.x+y=9
B.x+y=3
C.x+y=-3
D.x+y=-9
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